Goofs

Second victim changes positions on the doll in continuous shots.

Position in which the first victim is stabbed is face down, but in the next shot she is looking on the side. In shot after that she is on her face again and turned to look up.

The scientist who is arrested for drug smuggling refers to the tarantula as an insect. Spiders have 8 legs and belong to the class of arachnids. No scientist would make such an error.

Victim is instantly paralyzed when killer applies the poison, which isn't possible, because some, if only a little amount of time, is needed for any kind of poison to work.

When killer pulls the knife out from the second victim, it's clean.

Obvious doll used in scene when Zani falls down from the building.

Fake spider is used when inspector squashes it.

Crew member visible in second victim's clothes shop.